Answer:
I am rarely touched but often held and if you are smart you'll use me well.
I twist and turn and leave a loop. What am I?
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
Born of sorrow, grows with age, you need a lot to be a sage. What is it?
I pass before the sun but make no shadow. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.